Halogenated Heteroaryl Electrolytes for High-Voltage Capacitor Stability
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Solution Overview
Problem
Energy storage devices experience performance degradation, including capacitance fade, increased equivalent series resistance, self-discharge, and gas formation, at elevated operating voltages and temperatures, necessitating improved stability and performance under these conditions.
Innovation Solution
Incorporation of halogenated heteroaryl compounds as performance improvers in the electrolyte and electrode films of energy storage devices, which enhance stability and reduce undesirable chemical and electrochemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If operating voltage and temperature are increased to enhance energy storage and power capability, then energy storage capacity and power capability are improved, but chemical and electrochemical reactions occur that reduce performance and cause cell failure
Solution Approach 1:
The patent introduces halogenated heteroaryl compounds as intermediary substances in the electrolyte that mediate between the electrode and electrolyte interface. These compounds form protective interfacial layers that prevent direct harmful reactions between the electrolyte and electrodes, thereby enabling high voltage operation while maintaining device reliability and preventing cell failure.
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating halogenated heteroaryl compounds with specific molecular structures. This parameter change alters the electrochemical properties of the electrolyte, increasing its stability window and allowing operation at higher voltages and temperatures without triggering degradation reactions.
2Adaptability or versatility
If operating temperature is increased to broaden real-world use cases, then operational versatility is improved, but undesired chemical reactions increase resulting in performance reduction
Solution Approach 1:
The patent converts the potentially harmful effect of elevated temperature-induced chemical reactions into a beneficial outcome. The halogenated heteroaryl compounds are designed to undergo controlled reactions at elevated temperatures to form stable protective layers on the electrodes, which then prevent further harmful reactions. Thus, the thermal stress that would normally cause degradation is transformed into a self-protecting mechanism.
3Device complexity
If conventional electrolyte formulations are used at elevated voltages, then device simplicity is maintained, but capacitance fade and equivalent series resistance increase occur
Solution Approach 1:
The patent creates a composite electrolyte formulation by combining conventional electrolyte components with halogenated heteroaryl compounds. This composite approach maintains the basic simplicity of conventional electrolytes while incorporating specialized molecules that provide enhanced stability. The resulting electrolyte exhibits both the ease of handling of conventional formulations and the improved capacitance stability required for high-voltage operation.
Data Source
AI summary
Performance improvers and formulations for energy storage devices are disclosed. The performance improvers include halogenated aromatic heterocycle compounds that may be utilized to improve the performance of energy storage devices (e.g., capacitors) operating at voltage above 3 V (e.g., 3.2 V).